RETURNING FROM VACATION IN KNOXVILLE, IOWA WE WERE TRAVELING WEST ON THE TURNER TURNPIKE BETWEEN TULSA AND OKLAHOMA CITY. THE TRAVEL TRAILER HAD MADE A SUDDEN MOVE TO CHANGE LANES, I IMMEDIATELY SLOWED DOWN AND LOOKED IN MY LEFT MIRROR TO NOTICE A FIRE, SPARKS AND SMOKE COMING FROM THE LEFT SIDE OF THE TRAVEL TRAILER. I STOPPED AND EXTINGUISHED A FIRE IN THE LEFT REAR WHEEL BEARING AND HUB. I CALLED A HEAVY DUTY WRECKER SERVICE TO ASSIST IN MOVING THE TRUCK AND TRAILER FROM DANGER OF THE TURNPIKE. WE SPENT THE NIGHT IN THE PARKING LOT OF FLYING J TRUCK STOP. THE NEXT MORNING I WAS ABLE TO CALL A REPAIR SHOP TO HAVE THE TRAVEL TRAILER AXLES AND BEARINGS REPAIRED. CURRENTLY THE TRAILER IS IN OKLAHOMA CITY HAVING THE DAMAGES ASSESSED. THIS IS THE SECOND INCIDENT WE HAVE HAD ON THE SAME AXLE WITHIN 6 MONTHS. *TR